Corrector unit for a coil winding machine



Nov. 20, 1956 P. J. lcENBlcE CORRECTOR UNIT FOR A COIL WIND-ING MACHINE 2 'Sheets-Sheet 1 Afro/iw Nov. 20, 1956 P. J. lcENBlcE 2,771,250

CORRECTOR UNIT FOR A COIL. WINDING MACHINE Filed June 9, 1953 2 Sheets-Sheet 2 United States Patent CORRECTOR UNIT FOR A COIL WINDING MACHINE Phineas J. Icenbice, Cedar Rapids, Iowa, assignor to Collins Radio Company, Cedar Rapids, Iowa, a corporation of Iowa Application June 9, 1953, Serial No. 360,548

4 Claims. (Cl. 242-9) This invention relates in general to coil winding machines, and in particular to a corrector mechanism for a coil winding machine which corrects for slight discrepancies in the tuning characteristics of a coil.

In electronics it is oftentimes desirable to utilize wire wound coils to form inductive elements in various cir cuits. Such coils have been used for many years and various methods of winding them have been developed. One way of winding them is manually, wherein the wire is merely wound about a coil form and attached at either end. Various machines have been developed for winding coils which utilize the principle of a bobbin Winder on a sewing machine, wherein a reel of wire is supported near a coil form that is rotated. A wire guide controls the position of the wire on the coil form. The wire guide may be mounted on a movable arm which is controlled by a slide that is cam driven so that as the coil form is rotated simultaneous motion of the slide arm will occur due to the cam. Any desired turn versus distance characteristic is obtainable. This, of course, requires a cam for each variation in pitch in the coils.

It is an object of the present invention to provide a corrector mechanism for a wire winding machine so that the coil may be compensated.

Another object of this invention is to provide a corrector mechanism for a cam driven wire winding machine so as to obtain any desired inductance characteristic.

A feature of this invention is found in the provision for a cam driven coil winding machine wherein the wire guide member is secondarily controlled by a pivot arm which rides on an adjustable means.

Further objects, features and advantages of the invention will become apparent from the following description and claims when read in view of the drawings, in which:

Figure l is a partially cut away isometric wire of the coil winding machine of this invention;

Figure 2 is a detailed side view of the corrector mechanism of this invention; and

Figure 3 is an exploded view of the corrector mechanism of this invention.

With reference to Figure 1, a base plate designated generally as has mounted thereon a housing 11 which rotatably supports a longitudinal shaft 12. A coil form 13 may be received on the end 14 of the shaft 12 externally of the housing.

A driving means which, for simplicity is shown as a crank 16, is attached to the shaft 12 to provide a driving force. It is to be realized, of course, that the machine may be made automatic by connecting a suitable motor. A worm 17 is formed on the shaft 12 and engages a gear 18, firmly attached to a transversely rotatably supported shaft 19 that extends through the housing 11. A cam 21 is detachably connected to the shaft 19.

A slide arm 22 is received through guides 23 and 24 attached to the housing 11 so that the arm 22 may be moved longitudinally relative thereto.

v ports a pin 51 which carries a bearing 52.

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A transverse pin 26 engages the cam surface 27 so as to drive the slide arm 22. A spring 28 is attached to the housing and to the slide arm so as to bias the pin 26 against the cam surface 27.

Attached to the base plate 10 is a stand-olf 29 that has a horizontal shaft 31 attached thereto. A reel of wire 32 may be placed on the shaft 31. An arm 33 is connected to another stand-off 30 and carries a pulley 34 over which the wire 36 extends. y

The end 37 of slide arm 22 has attached thereto, as best shown in the exploded view of Figure 3, a generally rectangular plate 38. A follow arm 39 is generally L- shaped and has a bearing 41 mounted near the corner thereof which is receivable over a pin 42. Pin 42 is attached to the plate 38 so that lever arm 39 may rotate relative thereto.

A bracket 43 is also attached to the end 37 of the slide 22 and is formed with a transverse opening 44 through which a guide support shaft 46 extends.

A sleeve 47 is mounted on shaft 46. A spring 48 is mounted between the bracket 43 and sleeve 47 so as to bias shaft 46 toward the right relative to Figures l, 2 and 3.

An enlarged disc 49 is mounted on shaft 46 and sup- In the assembled position the short arm 53 of the follow arrn 39 engages the bearing 52 so as to control the longitudinal position of the guide support arm shaft 46 relative to the slide 22.

The guide arm shaft 46 passes through a guide opening 54 formed in the housing 11. Also attached to the guide arm shaft 46 is a bracket 56 best shown in Figure 2, which has an upwardly extending portion 57 on which are mounted a pair of guide pulleys 58 and 59. The wire 33 from the coil 32 passes over the pulleys 34, 58 and 59 and to the coil.

The long leg 61 of the follow arm 39 is formed with a sharp point 62 which is engageable with a washer assembly designated generally as 63. The washer assembly comprises a plurality of elongated or ovel shaped washers 64 which are formed with elongated or oval shaped openings 66 therein through which extends a square shaft 67. A pair of end plates 68 and 69 are attached at opposite ends of the washer assembly on the shaft 67 and may be tightened by a set screw 71 so as to form a rigid assembly of the washers. It is to be noted that the washers may move up and down relative to the shaft but may not rotate because the shaft 67 is square.

An upright plate 75 is mounted to -the base plate 10. A pair of oppositely cut plates 74 and 76 are attached together and one end of the shaft 67 extends therethrough. The two plates 74 and 76 are attached to a suitable bearing 77 by means of a pin 78. The bearing 77 is attached to plate 75. A pair of horizontal stand-offs 79 and 80 are attached to plate 75 and a bar 81 is attached to the stand-oils by set screws 90. The shaft 73 extends therethrough and the bar 81 may be tightened on shaft 73 by a pair of set screws which are attached to the stand-offs. When they are tightened `they limit the motion of the shaft 73.

In operation the coil form 13 is placed on the spindle shaft 14 and the shaft is rotated by the crank 16. As previously stated this may be driven by a motor if desired. Due to the rotational relationship caused by the worm and gear 17 and 18, the cam 21 will turn, thus causing the slide member 22 to move relative to the housing 11 and coil form 13. This causes the wire guide pulleys 58 and 59 to move an vary the pitch of the coil. The variation depends upon the shape of the cam 21.

Let it be assumed that the washer assembly 63 is mounted so as to be straight and horizontal, such as shown in Figure 1. Suppose that after the coil is wound and tested, it is seen that in certain portions of the curve slight inaccuracies exist. These inaccuracies may be compensated by adjusting the two variables of the tuning corrector assembly. These are the angle of the -shaft 73 and the yshape of the upper curve' formed by the washer assembly 63 upon which the point 62 of the follow arm 39 rests.

When it is desired to wind a coil with a particular inductance characteristic, a cam which has been cut approximately forA this characteristic is attached to the shaft 19 and a sample coil is wound. After it is wound its inductance versus slug position characteristic is plotted and the shape noted. If at certain points in the curve, undesirable Aeffects are noted, adjustment may be made in two ways by the corrector mechanism of this invention.

The irst method of correcting is to loosen the bar 81 relative to the stand-offs so that the washer assembly 63 which is connected to the shaft 6"! may be pivoted about the pin 7S upwardly or downwardly from the horizontal position. This will allow one type of correction.

A second manner of correcting the inductance characteristic is `to loosen the set screw 71 so that the end plates 68 and 69 fmay be -loosened and lthe upper surface of the spacer washers adjusted to form a desired curve. After the desired form is obtained, the end washers 68 and 69 may be tightened. The yparticular shape of the upper surface of the washer assembly may be obtained empirically but .certain relationships are discovered after a numberof attempts yhave been made.

Thus, in Figure 2 the washer assembly has been adjusted to correct for yundesired errors in a particular coil. It is to be noted that the shaft 67 is pivoted upwardly yabout the pin 78 and that the washer assembly 63 has been adjusted -so that it has an irregular curve along its -top surface upon which the point 62 of the arm 39 u'des. Once the curve and angle of the washer assembly and the shaft 67 are obtained, any desired number of coils may be wound with the assurance that theyv will all be uniform and correct. In mass production runs, once 4the correct shape of the washer assembly and angle of the shaft- 67 is obtained, -they may be lockedin placeand the remaining coils made.

Although this invention relates .in general `to a corrector mechanism fora coil Winding machine, it is to be understood that the principles disclosed herein .are applicable to corrector mechanism of other machines.

Although it has been described with respect to va particular embodiment thereof, it is not to kbe so limited as changes and modilications may be made therein which are within the full intended scope ofthe invention, vas defined by the appended claims.

Iclaim:

1. A corrector unit yfor a coil winding machine com prising, Aa housing, a longitudinal shaft rotatablyA sup ported in said lhousing and adapted to receive a coil form, a slide arm supported by said housing for motion parallel to said shaft, a cam rotatablysupported by said housing and engaging said slide arm to move it relative :to the housing, said cam rotating as a function ofthe rotation of said longitudinal shaft, a followarm pivotally supported on one end of said slide arm, a Wireguide slideably mounted on said slide arm in engagenflent'with Said Lfollow arm, a cam member having a profile of adjustable configuration in a plane parallel to said shaft, said cam member being fixedly mounted on said housing, one end of said follow arm engaging said cam member, and said cam member varying the advance of said wire guide as a function of said guides advance, whereby a desired correction of the advance of-said wire guide is introduced.

2. Apparatus according to claim 1 wherein said cam member comprises a plurality of elongated Washers formed l-with elongated openings, a shaft extending through said openings in said washers, :and meansflfor clamping said washers to said shaft to form a rigid assembly.

3. A corrector mechanism for a coil winding machine having a slide arm-and'means forrotatably supporting a coil form comprising, a follow arm pivotally supported by one end of said slide arm, a wire guide positioned by said followfarm, a :cam I'assembly engaging said -follow arm,4 saidcamassembly-varying the position of said yWire guide as .a functionr .oflthe :positionof said wire guide, said cam assembly comprising a plurality .of washers, a square shaft..'passing through -said plurality `of washers, :said square shaft piyotallysupportedby said coil winding machine,.1and said ywasher `assembly adjustable so that the Washerssmay -be moved relative to each other, whereby said cannassembly introduces Va desired correction into the .motion fof' said. .Wire guide.

4. A corrector 'mechanismfor a coil -windingmachine whereinsaidcoilfwindinganachine comprises a base plate, ahousing supported on said base plate,a rst shaftrotatably :supported -byfsaid housingladapted Ato receive a coil form, a'. .slide armfslideablysupported by said housing-a Second =shat nrota'tably supported transversely of said irstishaftvI-bysaid housing,'means coupling said second shafttosaidlrst-s'haft, a cam attached to said second shaft: engaging saidlslideuarrn yto move it relative to the housing, .a follow. `amrlpivotally supported- -on one end xof Said slide arm, a wireflguide slideably mounted lon'said slideable :arm 'aand Apositioned by said follow arm, a standsoi attached to `saidlbase plate, Va cam assembly mounted on said stand-off engaging one end of Asaid followaarm tocompensate lforl linaccuracies in the 1cam,--said cam `:assembly comprising .a pivotal arm-supported by said4 v,stand-olf,- means for .locking `said- Apivotal arm Yiin AA21 fixed .angular position to saidstand-.o a plurality -of washers rformedwithelongated openings mounted'on said pivotal arm, and means for-a'djustingtlzte relative positions of said washers on said .pivotal arm.

References Cited inthe-:tile of this patent yUNITED STATES PATENTS 1,668,495 Elsner et al. May 1, `1928 1,688,164 Tarrant Oct. 16, 1928 1,864,187 Curtis lune 21, 1932 920,836 'Barnes Aug. l, 1933 2,016,865 Leitch Oct. l8, 1935 2,264,424 Winslow Dec. 2, 1941 .2,281,468 `Van Lammeren Apr., 28, '1942 '2,451,243 VSch'lums Oct. 12, .1948.

' FOREGN PATENTS 55,978 Germany Oct. 125,'1912 297,763 Greatl Britain Sept. 24, 1928 723,319 v Germany Aug. 3, 41.942 

